What is the technological process of pure cotton yarn? What is the technological process of polyester-cotton blended yarn? What's the difference

When cotton is spun into yarn, it usually goes through the main processes such as blowing, carding, drawing, roving and spinning. Yarn and thread used in high-end products also need combing. To produce cotton yarn with different requirements, different processing procedures should be adopted, such as spinning pure cotton yarn and polyester-cotton blended yarn. Due to different raw materials, different physical properties of raw materials and different product quality requirements, different production processes should be adopted in processing. (a) pure cotton yarn 1 process. Carding yarn: blowing → carding → head doubling → two doubling → roving → spinning → post-processing 2. Combed yarn: blowing → carding → pre-drawing → sliver winding → combing → head drawing → two drawing → roving → spinning → post-treatment (2). The technological process of polyester-cotton blended yarn is 1. Carding yarn: raw cotton: blowing → carding →→ head drafting → second drafting → third drafting → roving → spinning → post-processing polyester: blowing → carding → 2. Combed yarn: raw cotton: blowing → carding → pre-drafting → sliver → combing → head drafting →